//
//	Configuration
//
var fileLoadingImage = "images_lightbox/loading.gif";		
var fileBottomNavCloseImage = "images_lightbox/closelabel.gif";
var resizeSpeed = 7;	
// controls the speed of the image resizing (1=slowest and 10=fastest)
var borderSize = 15;	
//if you adjust the padding in the CSS, you will need to update this variable
var imageArray = new Array;
var activeImage;
var timer;

if(resizeSpeed > 10){ resizeSpeed = 10;}
if(resizeSpeed < 1){ resizeSpeed = 1;}
resizeDuration = (11 - resizeSpeed) * 0.15;

// -----------------------------------------------------------------------------------

//
//	Additional methods for Element added by SU, Couloir
//	- further additions by Lokesh Dhakar (huddletogether.com)
//
Object.extend(Element, {
	getWidth: function(element) {
	   	element = $(element);
	   	return element.offsetWidth; 
	},
	setWidth: function(element,w) {
	   	element = $(element);
    	element.style.width = w +"px";
	},
	setHeight: function(element,h) {
   		element = $(element);
    	element.style.height = h +"px";
	},
	setTop: function(element,t) {
	   	element = $(element);
    	element.style.top = t +"px";
	},
	setSrc: function(element,src) {
    	element = $(element);
    	element.src = src; 
	},
	setHref: function(element,href) {
    	element = $(element);
    	element.href = href; 
	},
	setInnerHTML: function(element,content) {
		element = $(element);
		element.innerHTML = content;
	}
});

// -----------------------------------------------------------------------------------

//
//	Extending built-in Array object
//	- array.removeDuplicates()
//	- array.empty()
//
Array.prototype.removeDuplicates = function () {
	for(i = 1; i < this.length; i++){
		if(this[i][0] == this[i-1][0]){
			this.splice(i,1);
		}
	}
}

// -----------------------------------------------------------------------------------

Array.prototype.empty = function () {
	for(i = 0; i <= this.length; i++){
		this.shift();
	}
}

// -----------------------------------------------------------------------------------

var Lightbox = Class.create();

Lightbox.prototype = {
	
	initialize: function() {	
		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');

		// loop through all anchor tags
		for (var i=0; i<anchors.length; i++){
			var anchor = anchors[i];
			
			var relAttribute = String(anchor.getAttribute('rel'));
			
			// use the string.match() method to catch 'lightbox' references in the rel attribute
			if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){
				anchor.onclick = function () {myLightbox.start(this); return false;}
			}
		}

		var objBody = document.getElementsByTagName("body").item(0);
		
		var objOverlay = document.createElement("div");
		objOverlay.setAttribute('id','overlay');
		objOverlay.style.display = 'none';
		objOverlay.onclick = function() { myLightbox.end(); return false; }
		objBody.appendChild(objOverlay);
		
		var objLightbox = document.createElement("div");
		objLightbox.setAttribute('id','lightbox');
		objLightbox.style.display = 'none';
		objBody.appendChild(objLightbox);

		var objLightboxFrame = document.createElement("div");
		objLightboxFrame.setAttribute('id','LightboxFrame');
		objLightbox.appendChild(objLightboxFrame);
		
		var objOuterImageContainer = document.createElement("div");
		objOuterImageContainer.setAttribute('id','outerImageContainer');
		objLightboxFrame.appendChild(objOuterImageContainer);

		var objTopBox = document.createElement("div");
		objTopBox.setAttribute('id','topBox');
		objOuterImageContainer.appendChild(objTopBox);
		
		var objTopNavCloseLink = document.createElement("a");
		objTopNavCloseLink.setAttribute('id','topNavClose');
		objTopNavCloseLink.setAttribute('href','#');
		objTopNavCloseLink.onclick = function() { myLightbox.end(); return false; }
		objTopBox.appendChild(objTopNavCloseLink);

		var objCaption = document.createElement("div");
		objCaption.setAttribute('id','caption');
		objTopBox.appendChild(objCaption);

		var objImageContainer = document.createElement("div");
		objImageContainer.setAttribute('id','imageContainer');
		objOuterImageContainer.appendChild(objImageContainer);
	
		var objLightboxImage = document.createElement("img");
		objLightboxImage.setAttribute('id','lightboxImage');
		objImageContainer.appendChild(objLightboxImage);
	
		var objHoverNav = document.createElement("div");
		objHoverNav.setAttribute('id','hoverNav');
		objImageContainer.appendChild(objHoverNav);

		var objPrevLink = document.createElement("a");
		objPrevLink.setAttribute('id','prevLink');
		objPrevLink.setAttribute('href','#');
		objPrevLink.setAttribute('title','Vorige');
		objPrevLink.onclick = function() { myLightbox.slideshowPrev(); return false; }
		objHoverNav.appendChild(objPrevLink);
		
		var objNextLink = document.createElement("a");
		objNextLink.setAttribute('id','nextLink');
		objNextLink.setAttribute('href','#');
		objNextLink.setAttribute('title','Volgende');
		objNextLink.onclick = function() { myLightbox.slideshowNext(); return false; }
		objHoverNav.appendChild(objNextLink);
	
		var objLoading = document.createElement("div");
		objLoading.setAttribute('id','loading');
		objImageContainer.appendChild(objLoading);
	
		var objLoadingLink = document.createElement("a");
		objLoadingLink.setAttribute('id','loadingLink');
		objLoadingLink.setAttribute('href','#');
		objLoadingLink.onclick = function() { myLightbox.end(); return false; }
		objLoading.appendChild(objLoadingLink);
	
		var objLoadingImage = document.createElement("img");
		objLoadingImage.setAttribute('src', fileLoadingImage);
		objLoadingLink.appendChild(objLoadingImage);

		var objImageDataContainer = document.createElement("div");
		objImageDataContainer.setAttribute('id','imageDataContainer');
		objImageDataContainer.className = 'clearfix';
		objLightboxFrame.appendChild(objImageDataContainer);

		var objImageData = document.createElement("div");
		objImageData.setAttribute('id','imageData');
		objImageDataContainer.appendChild(objImageData);

		var objBottomThumbs = document.createElement("div");
		objBottomThumbs.setAttribute('id','bottomThumbs');
		objImageData.appendChild(objBottomThumbs);

		var objBottomNav = document.createElement("div");
		objBottomNav.setAttribute('id','bottomNav');
		objBottomNav.style.display = 'none';
		objImageData.appendChild(objBottomNav);

		var objBottomNavPrev = document.createElement("a");
		objBottomNavPrev.setAttribute('id','bottomNavPrev');
		objBottomNavPrev.setAttribute('href','#');
		objBottomNavPrev.setAttribute('title','Vorige');
		objBottomNavPrev.onclick = function() { myLightbox.slideshowPrev(); return false; }
		objBottomNav.appendChild(objBottomNavPrev);

		var objBottomNavPause = document.createElement("a");
		objBottomNavPause.setAttribute('id','bottomNavPause');
		objBottomNavPause.setAttribute('href','#');
		objBottomNavPause.setAttribute('title','Pauzeer slideshow');
		objBottomNavPause.onclick = function() { myLightbox.slideshowPause(); return false; }
		objBottomNav.appendChild(objBottomNavPause);

		var objBottomNavPlay = document.createElement("a");
		objBottomNavPlay.setAttribute('id','bottomNavPlay');
		objBottomNavPlay.setAttribute('href','#');
		objBottomNavPlay.setAttribute('title','Start slideshow');
		objBottomNavPlay.onclick = function() { myLightbox.slideshowStart(); return false; }
		objBottomNav.appendChild(objBottomNavPlay);

		var objBottomNavNext = document.createElement("a");
		objBottomNavNext.setAttribute('id','bottomNavNext');
		objBottomNavNext.setAttribute('href','#');
		objBottomNavNext.setAttribute('title','Volgende');
		objBottomNavNext.onclick = function() { myLightbox.slideshowNext(); return false; }
		objBottomNav.appendChild(objBottomNavNext);

		var objBottomStatus = document.createElement("div");
		objBottomStatus.setAttribute('id','bottomStatus');
		objImageData.appendChild(objBottomStatus);
	},
	
	//
	//	start()
	//	Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
	//
	start: function(imageLink) {	
		hideSelectBoxes();

		// stretch overlay to fill page and fade in
		var arrayPageSize = getPageSize();
		Element.setHeight('overlay', arrayPageSize[1]);
		new Effect.Appear('overlay', { duration: 0.2, from: 0.0, to: 0.8 });

		imageArray = [];
		imageNum = 0;		
		slideshow = 0;
		slideshow_interval = 5000;
		slideshow_runs = true;

		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');

		// if image is NOT part of a set..
		if((imageLink.getAttribute('rel') == 'lightbox')){
			// add single image to imageArray
			imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));			
		} else {
			// if image is part of a set..
			slideshow = 1;
			// loop through anchors, find other images in set, and add them to imageArray
			// ALSO check anchors href=# >> btn!!
			for (var i=0; i<anchors.length; i++){
				var anchor = anchors[i];
				if (anchor.getAttribute('href') && (anchor.getAttribute('rel') == imageLink.getAttribute('rel')) && (anchor.className!="slideshow_start") ){
					imageArray.push(new Array(anchor.getAttribute('href'), anchor.getAttribute('title'), anchor.style.backgroundImage));
				}
			}
			imageArray.removeDuplicates();
			while(imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++; }

			th_html = "";
			for (var i=0; i<imageArray.length; i++){
				var th = imageArray[i][2];
				th_html += "<div class='thumb notcurrent' id=\"thumb"+i+"\" onclick=\"javascript:myLightbox.thumbClick("+i+");\" style=\"background-image:"+th+";\"></div>";
			}
			Element.setInnerHTML('bottomThumbs', th_html);
		}
		
		if (imageArray.length==1) {
		        // 1 image -> hide 'next'/'previous' navigation
                        Element.hide("prevLink");
                        Element.hide("nextLink");
                        Element.hide("bottomThumbs");
                        Element.hide("bottomNav");
                        Element.hide("bottomNavNext");
                        Element.hide("bottomNavPrev");
                        Element.hide("bottomNavPause");
                        Element.hide("bottomNavPlay");
                        Element.hide("bottomStatus");
		}
		
		window.setTimeout ("myLightbox.start2()", 400);
        
        },

	start2: function() {
		/*
		// calculate top offset for the lightbox and display 
		var arrayPageSize = getPageSize();
		var arrayPageScroll = getPageScroll();
		var lightboxTop = arrayPageScroll[1]; //arrayPageScroll[1] + (arrayPageSize[3] / 15);
		Element.setTop('lightbox', lightboxTop);		
		*/
		window.status=window.status + " // start3";
		// goto top of the page!
		location.hash = 'pagetop';
		Element.show('lightbox');
		// scedule slideshowticks, if... 
		if (slideshow == 1) {
			Element.show('bottomNav');
			myLightbox.slideshowStart();
		}
		myLightbox.changeImage(imageNum);
	},

	//
	//	changeImage()
	//	Hide most elements and preload image in preparation for resizing image container.
	//
	changeImage: function(imageNum) {	
		activeImage = imageNum;	// update global var
		// hide elements during transition
		Element.show('loading');
		Element.hide('lightboxImage');
		Element.hide('hoverNav');
		imgPreloader = new Image();
		// once image is preloaded, resize image container && display image
		imgPreloader.onload=function(){
			Element.setSrc('lightboxImage', imageArray[activeImage][0]);
			myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);
			
			// don't do this with timeouts! bugfix EA @ Tremani
        		myLightbox.showImage();
        		myLightbox.thumbSetCurrent(imageNum);
		}
		imgPreloader.src = imageArray[activeImage][0];
	},

	//
	//	resizeImageContainer()
	//
	resizeImageContainer: function( imgWidth, imgHeight) {

		imgMaxWidth = 875 - (borderSize * 2);
		if(imgWidth <= imgMaxWidth) {
			imgWidth = imgMaxWidth;
		}
		// get current height and width
		this.wCur = Element.getWidth('outerImageContainer');
		this.hCur = Element.getHeight('outerImageContainer');

		// scalars based on change from old to new
		this.xScale = ((imgWidth  + (borderSize * 2)) / this.wCur) * 100;
		this.yScale = ((imgHeight  + (borderSize * 2) + 10) / this.hCur) * 100;

		// calculate size difference between new and old image, and resize if necessary
		wDiff = (this.wCur - borderSize * 2) - imgWidth;
		hDiff = (this.hCur - borderSize * 2) - imgHeight;
		
		if(!( hDiff == 0)){ new Effect.Scale('outerImageContainer', this.yScale, {scaleX:false, duration:resizeDuration, queue:'front', scaleContent:false}); }
		if(!( wDiff == 0)){ new Effect.Scale('outerImageContainer', this.xScale, {scaleY:false, delay:resizeDuration, duration:resizeDuration, scaleContent:false}); }

		// resize Next/Prev buttons
		
		// if new and old image are same size and no scaling transition is necessary, 
		// do a quick pause to prevent image flicker.
		if((hDiff == 0) && (wDiff == 0)){
			if (navigator.appVersion.indexOf("MSIE")!=-1){ pause(250); } else { pause(100);} 
		}

	},

	thumbClick: function(imageNum) {
		myLightbox.slideshowPause();
		myLightbox.changeImage(imageNum);
	},

	thumbSetCurrent: function (imageNum) {
		// set current img selected in thumbnails
		for (var i=0; i<imageArray.length; i++){
			var ele = document.getElementById('thumb'+i);
			
			if (ele!=undefined) {
        			if (i == imageNum) { 
        				ele.className = "thCurrent";
        			} else { 
        				ele.className = "thumb"; 
        			}
			}
		}
	},

	slideshowStart: function() {
		slideshow_runs = true;
		if (imageArray.length>1) {
        		Element.setInnerHTML('bottomStatus',"Beelden worden als slideshow afgespeeld.");
        		Element.show('bottomNavPause');
        		Element.hide('bottomNavPlay');
		}
		timer = window.setTimeout ( "myLightbox.slideshowTick()", slideshow_interval);
	}, 

	slideshowTick: function() {
		if(slideshow_runs) {
			if(activeImage == (imageArray.length - 1)){
				// reached the end of array!
				nextImage = 0; 
			} else {
				nextImage = activeImage + 1;
			}
			myLightbox.changeImage(nextImage);
			// schedule next one!
			timer = window.setTimeout ( "myLightbox.slideshowTick()", slideshow_interval);
		}
	},
	
	slideshowPause: function() {
		if(slideshow_runs) {
			slideshow_runs = false;
			window.clearTimeout(timer);
			Element.show('bottomNavPlay');
			Element.hide('bottomNavPause');
			Element.setInnerHTML('bottomStatus',"De slideshow is gepauzeerd.");
		}
	}, 

	// show next slide, and make sure timer is reset - so it doesnt jump to slide +2 !!
	slideshowNext: function() {
		if(activeImage == (imageArray.length - 1)){
			// reached the end of array!
			nextImage = 0; 
		} else {
			nextImage = activeImage + 1;
		}
		myLightbox.changeImage(nextImage);		
		if(slideshow_runs) {
			window.clearTimeout(timer);
			timer = window.setTimeout ( "myLightbox.slideshowTick()", slideshow_interval);
		}
	}, 

	slideshowPrev: function() {
		if(activeImage == 0){
			// reached the end of array!
			nextImage = (imageArray.length - 1); 
		} else {
			nextImage = activeImage - 1;
		}
		myLightbox.changeImage(nextImage);		
		if(slideshow_runs) {
			window.clearTimeout(timer);
			timer = window.setTimeout ( "myLightbox.slideshowTick()", slideshow_interval);
		}
	}, 
	
	//
	//	showImage()
	//	Display image and begin preloading neighbors.
	//
	showImage: function(){
		Element.hide('loading');
		new Effect.Appear('lightboxImage', { duration: 0.5, queue: 'end', afterFinish: function(){	myLightbox.updateDetails(); } });
		this.preloadNeighborImages();
	},

	//
	//	updateDetails()
	//	Display caption, image number, and bottom nav.
	//
	updateDetails: function() {
		Element.show('caption');
		Element.setInnerHTML('caption', imageArray[activeImage][1]);
		myLightbox.updateNav();
	},

	//
	//	updateNav()
	//	Display appropriate previous and next hover navigation.
	//
	updateNav: function() {
		Element.show('hoverNav');	
		if(imageArray.length != 1){
			// set height to img height!
			hImg = Element.getHeight('lightboxImage');
			Element.show('prevLink');
			Element.show('nextLink');
			Element.setHeight('hoverNav', hImg);
			Element.setHeight('prevLink', hImg);
			Element.setHeight('nextLink', hImg);
		}
		this.enableKeyboardNav();
	},

	//
	//	enableKeyboardNav()
	//
	enableKeyboardNav: function() {
		document.onkeydown = this.keyboardAction; 
	},

	//
	//	disableKeyboardNav()
	//
	disableKeyboardNav: function() {
		document.onkeydown = '';
	},

	//
	//	keyboardAction()
	//
	keyboardAction: function(e) {
		if (e == null) { // ie
			keycode = event.keyCode;
		} else { // mozilla
			keycode = e.which;
		}

		key = String.fromCharCode(keycode).toLowerCase();
		
		if((key == 'x') || (key == 'o') || (key == 'c')){	// close lightbox
			myLightbox.end();
		} else if(key == 'p'){	// display previous image
			if(activeImage != 0){
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage - 1);
			}
		} else if(key == 'n'){	// display next image
			if(activeImage != (imageArray.length - 1)){
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage + 1);
			}
		}


	},

	//
	//	preloadNeighborImages()
	//	Preload previous and next images.
	//
	preloadNeighborImages: function(){

		if((imageArray.length - 1) > activeImage){
			preloadNextImage = new Image();
			preloadNextImage.src = imageArray[activeImage + 1][0];
		}
		if(activeImage > 0){
			preloadPrevImage = new Image();
			preloadPrevImage.src = imageArray[activeImage - 1][0];
		}
	
	},

	//
	//	end()
	//
	end: function() {
		this.disableKeyboardNav();
		Element.hide('lightbox');
		new Effect.Fade('overlay', { duration: 0.2});
		showSelectBoxes();
		window.clearTimeout(timer);
	}
}

// -----------------------------------------------------------------------------------

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}

// -----------------------------------------------------------------------------------

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

// -----------------------------------------------------------------------------------

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//
function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();
	
	if(key == 'x'){
	}
}

// -----------------------------------------------------------------------------------

//
// listenKey()
//
function listenKey () {	document.onkeypress = getKey; }
	
// ---------------------------------------------------

function showSelectBoxes(){
	selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}
}

// ---------------------------------------------------

function hideSelectBoxes(){
	selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "hidden";
	}
}

// ---------------------------------------------------

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}

// ---------------------------------------------------



function initLightbox() { myLightbox = new Lightbox(); }
Event.observe(window, 'load', initLightbox, false);